body {
    min-width: 320px;
    max-width: 750px;
    width: 10rem;
    margin: 0 auto;
    line-height: 1.5;
    font-family: Arial,Helvetica;
    background: #f2f2f2;
    height: 2000px;
}
//当页面尺寸大于750px时，固定基准字体75px
@media screen and (min-width: 750px) {
    html {
        font-size: 75px!important;
    }
}
.search-content {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 10rem;
    height: 1.1733rem;
    background-color: pink;
}